Ryan Ruan contributed to the Skyscanner/backpack repository by addressing a hydration mismatch issue in the useMediaQuery hook for server-side rendering scenarios. He implemented client-side hydration protection when the matchSSR parameter is used, ensuring that UI consistency is maintained during initial renders. Using JavaScript and TypeScript, Ryan expanded the test suite to cover a range of SSR edge cases, validating hydration behavior across different rendering paths. His work focused on front end development and testing, resulting in reduced hydration warnings and improved stability for SSR-driven layouts. The depth of his contribution enhanced reliability for production-like SSR deployments.